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Combined effect of grain size and tensile stresses on the ferroelectric properties of sol-gel (Pb,La)TiO3 thin films

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Abstract

Transmission electron microscopy has shown that the grain size of sol-gel-prepared lanthanum-modified lead titanate films increases from ∼100 to ∼1 μm when the excess of PbO in the precursor solution is reduced from 20 to 10 mol%. Switchable polarization is higher in the films with a smaller grain size. Profilometry and the temperature dependence of the dielectric permittivity indicate that films are tensile stressed by the substrate. The grain-size effect on polarization switching is explainedby taking into account this tensile stress, which is thought to induce some a-domain orientation and 90° domain wall clamping in the grains attached to the substrate.

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Authors and Affiliations

  1. Instituto de Ciencia de Materiales, Consejo Superior de Investigaciones Cientificas, Cantoblanco, 28049, Madrid, Spain

    M. Alguerá & L. Pardo

  2. Centre d’Elaboration des Materiaux et dés Etudes Strucuturales, Centre National de la Recherche Scientifique, BP4347, F-31055, Toulouse, France

    E. Snoeck

Authors
  1. M. Alguerá
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  2. M. L. Calzada
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  3. L. Pardo
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  4. E. Snoeck
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Alguerá, M., Calzada, M.L., Pardo, L. et al. Combined effect of grain size and tensile stresses on the ferroelectric properties of sol-gel (Pb,La)TiO3 thin films. Journal of Materials Research 14, 4570–4580 (1999). https://doi.org/10.1557/JMR.1999.0619

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  • DOI: https://doi.org/10.1557/JMR.1999.0619

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